Question


Answer

Let b = a^2+a

The original expression is converted to

(a^2+a)^2-8(a^2+a)+12

=b^2-8b+12

=(b-2)(b-6)

Substitute b and continue factoring

(a^2+a-2)(a^2+a-6)

(a+2)(a-1)( a+3)(a-2)

Steven Zheng posted 1 month ago

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